Device for anchoring tubing



May 14, 1957 E. w. JONES DEVICE FOR ANCHORING TUBING Filed March 30, 1953 INVENTOR EARL I44 JONES ATTORNEYS Stat DEVICE FOR AN CHORlNG TUBING Earl W. Jones, Abilene, Tex., assignor to H-J-M Tool Company, Abilene, Tex.

Application March 30, 1953,'Serial No. 345,400

4 Claims. (Cl. 166-212) desirable to anchor or hold down the tube against the influences of these vibrations or pressures thereagainst and to this end one or more of the present anchors can be connected in the length of tubing and will grip the surrounding casing duringthe passage of the pressurized fluid retaining-the tubing against longitudinal and lateral movements.

Accordingly, the principal object of the present device is to provide a device which can be quickly and easily interconnected in lengths of tubing and will automatically grip a surrounding casing for holding said tubing in position during the introduction of pressurized media into said tubing, yet will release the casing when the pressure in the casing is equal to orexceeds the pressure in said tubing.

A further and equally important object of the invention is to provide a tubing anchor which is positive acting under adverse conditions, will not permit the loss of pressure within the'connected tubing, and through its simplicity of construction can be economically produced and maintained.

Further objects of the invention will be in part pointed out and in part obvious in the following description of the accompanying drawings, wherein:

Fig. 1 is a side elevation of the present tube anchor.

Fig. 2 is a vertical cross-sectional view of the tube anchor taken on line 2-2 of Figs. 1 and 3, but illustrating the various positions of the pistons.

Fig. 3 is a horizontal cross-sectional view of the tube anchor casing taken on line 33 of Fig. 2.

Fig. 4 is a view of the top outer face of one of the pistons forming a part of the present device.

Fig. 5 is a side elevation of said piston, and

Fig. 6 is a cross sectional View of said piston taken on line 66 of Fig. 4.

Referring now more particularly to the accompanying drawings wherein like and corresponding parts are desig nated by similar reference characters, numeral 1 refers to the anchor tubing housing, which in the present form as illustrated in the drawings, is of a cylindrical configuration and has a reduced portion 2 extending from the top end of said housing with a further reduced portion 3 having a threaded peripheral portion 4. The opposite end of said housing has a reduced portion 5 extending from the lower end thereof. The bore 6 of said portion 5 is threaded as at 7 and thereafter tapers inwardly as at 8 forming a stop. A bore 9 extends from stop 8 through housing 1 and its connected portions 2, 3 and 4.

- Patented May 14, .1957

The exterior of housing 1 has a series of longitudinally extending grooves 10 formed in the periphery thereof for providing a channelway for the passage of fluid past said housing.

Housing 1 further has, in the example shown in the present drawing, three series of cylindrical recesses 11 provided in the periphery of said housing with each series extending longitudinally thereof and with the recesses 11 extending radially from the longitudinal axis of bore 9 and open at the periphery of said housing. Recesses 1%) are positioned between each series of said recesses 111.

the longitudinal center line thereof extending across a diameter of each recess of one series thereof. A plurality of bars 15 each are positioned in one of said slots 14 whereby the bar extends longitudinally of housing 1 and across the centers of recesses 11 of one series. Bars 15 having a series of openings therethrough with housing 1 having corresponding threaded recesses whereby screws 16 are employed for fastening bars 15 throughout their length to housing 1. Apluralityof piston slips 17, each having a rounded serrated top surface 18 with a diametrical slot 19, are each positioned in one of said recesses 11. Said pistons 17 are of an annular configuration and sized for sliding fit within its respective recess 11. A pair of guide recesses 20 are also formed in each piston 17 with a guide recess opening into slot 19. The periphery of each piston also has a plurality of annular recesses 21 extending therearound in which are positioned rings or p'ackings 22. The bottom face 23 of each piston 17 is flat for coinciding with shoulders 13 of the respective recess and extending across the respective port 12. Each piston is arranged inits recess with one of said bars '15 extending partially within slot 19. A pair of coil springs '24 are each mounted within one of said guide recesses 20 of each pistonand extends through slot 19 across the bar 15 positioned outwardly thereof for normally moving the piston 17 inwardly, until bottom 23 contacts the adjacent shoulder 13, as shown in the top right hand recess 11 of Fig. 2. The present tubing anchor can be quickly and readily joined to the end of or between sections of a tube by screwing threaded portion 4 into a threaded bore of the tubing until the end of the tubing contact-s reduced portion 2. whereby it is stopped from further downward movement. Additional sections'of the tubing canbe connected to the opposite end of housing 1 by screwing a threaded peripheral end portion of a tubing int-o bore 6 and engaging thread 7 until stopped by shoulder 8. Thus the tubing having the present anchor attached thereto can be inserted in the usual well casing whose diameter is suflicient for slidably receiving housing 1. When it is desired to anchor the tubing in the housing, media under pressure can be introduced through the bore of the tubing and when it reaches bore 9 of the present device, the media will extend through ports 12 against the bottoms 23 of each piston slip 17 moving said piston slips to the position shown in the middle right hand recess 11 of Fig. 2 against coil springs 24 retained by their respective bar 15 with the serrated face 18 of the piston thereupon extending beyond the bar 15 and periphery of housing 1 for biting into the surrounding casing. The serrations 18 will bite into the casing face firmly anchoring the device in position and preventing the 3 tubing from moving either radially or longitudinally of the casing. Fluids in the space between the tubing and easing can readily pass around housing 1 by passing through the recessed portions, 10.

Rings or packings 22 will bear against the walls of recess 11 preventing the leakage of media around said pistons which might reduce the pressure in bore 9 and therefore the full force of the pressure can be maintained against each piston.

Upon the operator releasing the pressure within the tubing and bore 9, each piston 17 will automatically return within its recess 11 due to the action of the springs 24 bearing thereagainst. Thereafter the tubing can be moved up or down within the casing as desired.

It is to be appreciated that the present device is capable of considerable modification and such changes thereto as come within the scope of the appended claims is deemed to be a part of the invention.

What I claim is:

l. A device for anchoring tubing to a well casing comprising a housing adapted to be interconnected in a length of tubing and having a plurality of series of cylindrical recesses provided in the outer face thereof with each series extending in substantially a straight line and a bore extending longitudinally through said housing, a plurality of pistons each slidably mounted in one of said cylindrical recesses and having a serrated casing gripping head which has a recess provided thereacross, a plurality of bars fixedly mounted on the outer face of said housing with each bar extending across the recesses of one of said series of cylindrical recesses and positioned for entering said recesses of said pistons upon the outward movement of said pistons, said housing further having a plurality of ports each extending from said bore to one of said cylindrical recesses and resilient means positioned between said bars and said pistons and tending to move said pistons towards the bottoms of their respective cylindrical recesses. V

2. A device for anchoring tubing to a well casing comprising a housing adapted to be interconnected in a length of tubing and having a plurality of straight line series of cylindrical recesses provided in the outer face thereof and a bore extending longitudinally therethrough, a plurality of pistons each slidably mounted in one of said cylindrical recesses, each of said pistons having a diametrically extending recess and easing engaging serrations provided in the outer face thereof, a plurality of 3. A device for anchoring tubing to a well casing comprising a housing adapted to be interconnected in a length of tubing and having at least one series of cylindrical recesses provided in the outer face thereof and a bore extending longitudinally therethrough, a plurality of pistons each slidably mounted in one of said cylindrical recesses, each of said pistons having a diametrically extending recess provided in the outer face thereof and a plurality of guide recesses opening into said diametrical recess, at least one bar mounted on the outer face of said housing and extending diametrically across the recesses of a series of said housing cylindrical recesses for entering said piston diametrical recesses upon outward movement of said pistons, a plurality of coil springs each mounted in one of said piston guide recesses and extending through its respective piston diametrical recess against the bar positioned in line therewitth, said housing having a plurality of ports positioned for-placing said housing bore in communication with one of said cylindrical recesses and each of said pistons having serrations provided on the outer face thereof on either side of said diametrical recesses thereof. 1

4. A device for anchoring tubing to a Well casing comprising a tubular housing adapted to be interconnected in a length of tubing and having a plurality of series of radially extending cylindrical recesses provided in the periphery of said housing with each series of recesses extending longitudinally of said housing, said housing further having a plurality of ports each of a smaller diameter than one of said cylindrical recesses and extending radially. of said housing between one of said cylindrical recesses and the bore of said housing, a plurality of pistons each slidably mounted in one of said cylindrical recesses having casing engaging serrations provided in its outer j face and being of a larger diameter than the connecting port, 'rings mounted on the periphery of each of said pistons for sealing the space between said piston periphcry and the wall of its respective cylindrical recess, means mounted on said housing for limiting the outward move- .ment of said pistons and meanspositioned between said 7 piston and said piston limiting means tending to move I said pistons towards said housing bore.

References Cited in the file of this patent UNITED STATES PATENTS 789,867 'McCallum May 16, 1905 1,694,870 Scott Dec. 11, 1928 2,159,640 Strom May 23, 1939 2,546,669 Kirby Mar. 27, 1951 2,565,736 McCarvell Aug. 28, 1951 2,603,292 Page July 15, 1952 2,612,346 Nelson Sept. 30, 1952 FOREIGN PATENTSv 1,087,045 France Aug. 18, 1954 

